Microwave Motion Sensor mainly used for security purpose. It sense an intruder and send an alert to the monitoring center. It works on microwave pulses and measure the reflection off a moving objects and also cover large area than infrared sensors. This sensor is best for security because it's rediation easily penetrate through wall and holes. 

• Application of Microwave Motion Sensor are following;
• Detect heart beat of human being
• Elevator shaftway
• traffic law enforcement
• monitoring the light system of a house or a building